Hey Philistine
Im actually a manager at Jaycar,
As n87 said Pretty sure these relays are common on pins 4 and 8.
3 , 7 are NC
2 , 6 are NO.
And yeah chuck a multimeter on continuity buzz and you can pretty easily check whats what
Im back at work on Friday arvo to Sunday
Feel free to give me a buzz on the store phone if you get stuck mate
(03) 6240 1525